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    <title>Document</title>
    <script>

        //函数就是封装了一段可以被重复调用的代码块 目的：就是让大量代码块可以重复使用
        function getSum(num1,num2){
            var sum=0;
            for(var i=num1; i<=num2;i++){
                sum +=i;
            }
            console.log(sum);
        }

        getSum(1,100);
        getSum(10,50);
    </script>
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